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    <title>Document</title>
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     <!-- 模板内容 -->
     <div id="demo">
        <div :class="[activeClass,errorClass]"> 也可以把一个数组传递给v-bind:class,主要用来应用一个样式的列表</div>
      
    </div>
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        var demo = new Vue({
            el:"#demo",
            data:{
                activeClass:'active',
                errorClass:'text-danger'
               
            }
        })
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